When the population of Rome reached one million people in 1st century AD, it was the largest city the world had ever seen. However, the capital had a major problem - keeping the people fed.

For years, historians have tried to understand how emperors managed to get food from the sea to the city and now, they may have found the missing piece of the puzzle.

Learn the secrets behind the success of the great Roman Empire in Greatest Mysteries Revealed, all this weekend, on National Geographic UK. 📺

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About Nat Geo UK:
Igniting the explorer in all of us. National Geographic gets you closer to the stories that matter and past the edge of what's possible through groundbreaking storytelling. From the best and brightest scientists, explorers, photographers, and filmmakers, Nat Geo is the world's premium destination for science, exploration, and adventure.